Apparatus for extruding metals.



PATENTED MAR. 13, 1906.

N. A. ROBERTSON. APPARATUS FOR EXTRUDING METALS. APPLICATION FILED PEB.11. 1905.-

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INVENTOR: 4m

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omam I By Azzomeyq, WGLM Q WITNESSES: @414 No. 814,732. PATENTED MAR. 13, 1906.

N. A. ROBER I APPARATUS EXTR G METALS. APPLIO IILED FEB. 11. 1905.

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FIG. 2.

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UNITED STATES PATENT OFFICE.

NOB-MAN A. ROBERTSON, OF NEW YORK, N. Y.-' I

APPARATUS FOR EXTRUDING METALS. I

Patented March 13, 1906.

Application filed February 11, 1905. Serial No. 246,309.

To all whom,' it may concern.-

Be it known that I, NORMAN A. ROBERT- SON, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in A paratus for Extruding Metals, of which t e ollowing is a specification.

In my apphcation for patent, Serial N 0. 242,987, filed January 27, 1905, I have disclosed an apparatus which is specially ada ted for the extruding of stiff metals-such, or examdple, -as aluminium. The metalisintroduce in separate streams, the passa es or cylinders through which the metal is orced being a considerable distance apart from each other and from the core between them, so as to provide heavy walls capable of resisting extreme pressures at the extremely high temperatures necessary. The resent invention is based upon a speci 0 form of such an apparatus in which the product emerges in a direction at an angle with the vertical, the direction being preferably as nearly horizontal as possible, thereby obtaining important advantages in convenience and compactness. Preferably the core enters the die-chamber at the side olpposite the die, and the assages throughwhic the metalisforced lea downward and obliquely, so as to direct the metal toward the die, and thus minimize the strain on the core. Certain other advantages are referred to in detail hereinafter.

The accompanying drawings illustrate an embodiment of the invention.

Figure 1 is an approximately diametral section of the complete machine. Fi .2 is a section approximately on the plane% rmed by the center lines of the oblique passages and the cylinders. Fig. 3 is a-section on the line3 3 ofFig. 1. Fig. 4 is an under sideview of the block in which is the upper half of the die-chamber. Fig. 51's a to view of the block in which is the lower half 0 the same.

Although the machine illustrated is specially adapted for the diflicult class of work above referred to, it may also be used for extruding softer materials, if desired. The ma chine is also specially designed to have a core which may be used to form a hollow or tubular product or to carry a core-wire of the product, though in connection with some of the features claimed the core may be omitted so as to form a solid wire of the roduct.

In the embodiment of t e invention illustrated a plurality of separate passages lead downward into the die-chamber being elng connected back of said chamber and spaced apart a considerable distance each other. The term assage its generic sense to incln e the c linders in which the plungers reciprocate or t 1e oblique passa es or conduits which preferably connect the cylinders with the die-chamber and to include also the combination lique conduit with its cylinder.

Oblique conduits A are provided, preferabl two in number, which converge toward eac other to meet in the die-chamber B, which lies in the plane transverse to the line connecting the centers of the cylinders C, but in said plane is offset as far as convenient from the plane which passes through the two center lines of the cylinders C. The effect of offsetting the die-chamber from the plane of the two cylinders O is to deflect the course of the material from the vertical and to permit it to emerge in a horizontal or an approxi mately horlzontal direction. The die-chamber is provided with a die D at the outermost sidethat is, at the side toward which the oblique conduits A tend'and a core E, entering the chamber at the o posite side. The term .die chamber inc udes' the entire space surrounding the exposed portion of the core and in which the streams of material coalesce around the core. By this arrangement the movement of the material is in a of each obline nearly parallel with the core, so that even though the pressure be very great and the temperature very high the strain tending to bend the core is comparatively small. The

strain on the core is further avoided by using two oblique conduits A, which direct the material against opposite sides of the core. In fact, a .lar e part of the material passes around to t e under side of the core, as indicated by the arrows of Fig. 3. Here the two streams coalesce and pressupward against the under side, resisting the downward component of the pressure from the material which bears directly on the core at points aboveits center.

Preferably the principal parts of the machine are formed in three separate blocks, which I desi nate, respectively, as the upper block the intermediate block G, and the lower block H. It is understood, however, that the machine may be used in a horizontal position (that is to say, with its axis horizontal insteadof vertical, as illustrated,) in which case the two end blocks F from is used in the upper portion the oblique conduits A.

ing M for receivmgthe die D.

and ll are not, strictly speaking, upper and lower. blocks. The upper block is a solid cylindrical block with the two cylinders C formed therein and is thus very simple and very strong. lt [its directly upon the intermediate block G, the position being determined by the fitting of the lower ends of the cylinders upon bosses J at the mouths of 1n the intermediate block I are formed the oblique conduits A, of the die-chamber B, and the passage K for the reception of the core E.

I At its rear end the assa e K is screw-threaded, as indicated in Fig. 1, to permit adjustment of the core. A groove L may be provided at the rear of the block G in order to accommodate the head of the core E. In the lower block H are formed the lower portion of the die-chamber B and preferably a portion K of the passage for the core and also an open- The die may be introduced from the outside and adjusted by means of a hollow screw N, as is well understood in the art.

The core-wire O enters at the back of'the machine, passes through the hollow core E of the machine, upon emerging from which it is incased in the metal to be extruded, and the roduct P emerges throu h the die and the iollow screw and is wound on a reel or otherwise disposed of in continuous lengths. In the beginning of the operation the oblique conduits A and cylinders C are filled with aluminium or other material to be extruded, molten or in the form of slugs or otherwise, and, if necessary, brought to the desired temerature. A pair of plungers Q are then forced into the cylinders, preferably by raising the structure composed of the several blocks F, G, and H, by means of a hydraulic plunger R, and the material is forced down through the converging conduits A. In the chamber B the streams coalesce, as described, so as to equalize or nearly equalize the pressure on all sides of the core and to pass around the core of the machine through the die, carrying with them the core-wire 0. When the desired amount of material has been extruded, the plunger R is forced down, carrying with it the three blocks F, G, and H, it being connected to the upper block F by means of bolts S and a ring T. The metal to be extruded may be main- ,tained atthe v desired temperature by heating the apparatus from the outside, if necessary.

- For example, a series of gas-blowpipes may beiusedfor this purpose, with jets of flame impinging u on the blocks, as is understood by those ski led in the art.

Though I have described with great particularity of detail a specific embodiment of the invention, yet it is not to be understood therefrom that the invention is limited to the specific embodiment disclosed.

Various modifications thereof in detail and in the arrangement and combination of the parts may be made by those skilled in the art without departure from the invention.

What I claim is 1. An extruding machine having a die chamber with a die at one side and a core entering the chamber at the opposite side, cylinders in lines offset from said chamber, and passages extending obli uely from the cylinders in the direction of t 1e chamber and converging toward said chamber.

2. An extruding-machine having an end block in which is a lateral die, an intermediate block in which is a lateral core carried entirely by said intermediate block, and an opposite end block in which is a cylinder for conducting material to the die-chamber.

3. An extruding-machine having a block in which is a lateral die, and a second block in which are a lateral core and converging passages leading downward to the die-chamber.

4. An extruding-machine having a lower block in which is a lateral die, an intermediate block in which are a lateral core and a passage leading downward to the die-chamber, and an upper block in which is a cylinder from which the material is forced into and through said passage.

5. An extrudin -machine having a block in which is a die, and a second block in which is a core extending at an angle with the axis and in which is an oblique conduit extending at an acute angle with said core.

6. An extruding-machine having an end block in which is a die, an intermediate block in which is a core extending at an angle with the axis and in which is an oblique conduit extending at an acute angle with said core, and an opposite end block 1n which is a cylinder in the axial plane for conducting material to said oblique conduit.

7. An extruding machine having a diechamber with a die at one side and a core entering the chamber at the opposite side, a'

pair of cylinders in a plane oflset from said chamber, and a pair of passages extending obliquely from the plane of the cylinders in the direction of the chamber and converging toward said chamber.

8. An extruding machine having a die chamber with a die at one side and a core entering the chamber-at the opposite side, and having vertical cylinders C and converging passages A leading downward to said chamber, said chamber being offset from the plane of said cylinders, and said passages A being inclined to direct the material toward the side of the chamber in which is the die, so as to minimize the strain on the core and to counterbalance each other.

9. An extruding-machine having an end block H in which is a lateral die, an op osite end block F in which are vertical cylin ers C, and an intermediate block G in whlch is a lateral core E carried entirely by said intermediate block, the meeting faces of said blocks In Witness whereof I have hereunto si ned H and G being formed to provide a die-chammy name in the presence of two subscri ing ber B between them and offset from the lane wltnesses.

of said cylinders, and said intermediate lock NORMAN A. ROBERTSON. 5 havingconverging passages A leading down- Witnesses:

ward obliquely from said cylinders to said DOMINGE A. USINA,

die-chamber. THEODORE T. SNELL. 

